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Original title:
LDA measurements and turbulence spectral analysis in an agitated vessel
Authors: Kysela, Bohuš ; Konfršt, Jiří ; Chára, Zdeněk
Document type: Papers
Conference/Event: Experimental Fluid Mechanics 2012 /7./, Hradec Králové (CZ), 2012-11-20 / 2012-11-23
Year: 2012
Language: eng
Abstract: During the last years considerable improvement of the derivation of turbulence power spectrum from Laser Doppler Anemometry (LDA) has been achieved. The irregularly sampled LDA data is proposed to approximate by several methods e.g. Lomb-Scargle method, which estimates amplitude and phase of spectral lines from missing data, methods based on the reconstruction of the auto-correlation function (referred to as correlation slotting technique), methods based on the reconstruction of the time series using interpolation between the uneven sampling and subsequent resampling etc. These different methods were used on the LDA data measured in an agitated vessel and the results of the power spectrum calculations were compared. The measurements were performed in the mixing vessel with flat bottom. The vessel was equipped with four baffles and agitated with a six-blade pitched blade impeller. Three values of the impeller speed (Reynolds number) were tested. Long time series of the axial velocity component were measured in selected points. In each point the time series were analyzed and evaluated in a form of power spectrum.
Keywords: LDA/LDV; mixing; turbulence
Project no.: GAP101/12/2274 (CEP)
Funding provider: GA ČR
Host item entry: Experimental Fluid Mechanics 2012. Proceedings of the International Conference, ISBN 978-80-7372-912-7
Institution: Institute of Hydrodynamics AS ČR (web)
Document availability information: Fulltext is available on demand via the digital repository of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0213806
Permalink: http://www.nusl.cz/ntk/nusl-135086
The record appears in these collections:
Research > Institutes ASCR > Institute of Hydrodynamics
Conference materials > Papers
Authors: Kysela, Bohuš ; Konfršt, Jiří ; Chára, Zdeněk
Document type: Papers
Conference/Event: Experimental Fluid Mechanics 2012 /7./, Hradec Králové (CZ), 2012-11-20 / 2012-11-23
Year: 2012
Language: eng
Abstract: During the last years considerable improvement of the derivation of turbulence power spectrum from Laser Doppler Anemometry (LDA) has been achieved. The irregularly sampled LDA data is proposed to approximate by several methods e.g. Lomb-Scargle method, which estimates amplitude and phase of spectral lines from missing data, methods based on the reconstruction of the auto-correlation function (referred to as correlation slotting technique), methods based on the reconstruction of the time series using interpolation between the uneven sampling and subsequent resampling etc. These different methods were used on the LDA data measured in an agitated vessel and the results of the power spectrum calculations were compared. The measurements were performed in the mixing vessel with flat bottom. The vessel was equipped with four baffles and agitated with a six-blade pitched blade impeller. Three values of the impeller speed (Reynolds number) were tested. Long time series of the axial velocity component were measured in selected points. In each point the time series were analyzed and evaluated in a form of power spectrum.
Keywords: LDA/LDV; mixing; turbulence
Project no.: GAP101/12/2274 (CEP)
Funding provider: GA ČR
Host item entry: Experimental Fluid Mechanics 2012. Proceedings of the International Conference, ISBN 978-80-7372-912-7
Institution: Institute of Hydrodynamics AS ČR (web)
Document availability information: Fulltext is available on demand via the digital repository of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0213806
Permalink: http://www.nusl.cz/ntk/nusl-135086
The record appears in these collections:
Research > Institutes ASCR > Institute of Hydrodynamics
Conference materials > Papers
Record created 2012-12-03, last modified 2023-12-06